condition mean min max ZT0-3 36.79265 36.79265 36.79265 ZT4-7 24.648600000000002 24.648600000000002 24.648600000000002 ZT8-11 24.851799999999997 24.851799999999997 24.851799999999997 ZT12-15 22.25145 22.25145 22.25145 ZT16-19 25.015749999999997 25.015749999999997 25.015749999999997 ZT20-23 28.9194 28.9194 28.9194